C语言实现多态

/*
filename:c_duotai.c
author:cc
time:2016-05-06
*/
#include
#include


struct Human   //基类
{
	char Memoryalign[20];                      //对齐内存， 很重要
	void (*input)(struct Human *thiz);    //虚函数
	float (*score)(struct Human *thiz);    //虚函数
	void (*show)(struct Human *thiz);       //虚函数
};
struct Student  //派生类
{
	char m_name[12];
	int m_age;
	float m_score;


	//具体方法
	void (*input)(struct Student *thiz,  char *name, int age, float score);
	float (*score)(struct Student *thiz);
	void (*show)(struct Student *thiz);
	void (*change_score)(struct Student *thiz, float new_score);    //派生类单独具有的函数
};
//////////////////////////////////////////////////////////////////////////////////
void input_infor(struct Student *thiz, char *name, int age, float score)
{
	memmove((*thiz).m_name,name, strlen(name));
	(*thiz).m_age = age;
	(*thiz).m_score = score;
}
float get_score(struct Student *thiz)
{
	return (*thiz).m_score;
}
void show_infor(struct Student *thiz)
{
	printf("name :%s\n", (*thiz).m_name);
	printf("age:%d\n", (*thiz).m_age);
	printf("score:%f\n", (*thiz).m_score);
}
void change_infor(struct Student *thiz, float new_score)
{
	(*thiz).m_score = new_score;
}
void Init_Student(struct Student *thiz, char *name, int age, float score)  //子类构造函数
{
	memset((*thiz).m_name, '\0', 12);
	memmove((*thiz).m_name,name, strlen(name));
	(*thiz).m_age = age;
	(*thiz).m_score = score;
	(*thiz).input = input_infor;
	(*thiz).score = get_score;
	(*thiz).show = show_infor;
	(*thiz).change_score = change_infor;
}
////////////////////////////////////////////////////////////////////////////////
int main()
{
	struct Student stu;   //派生类对象
	struct Human *human = (struct Human *)&stu;   //基类指针指向派生类对象
	Init_Student(&stu, "caocao", 23, 98);  //派生类对象调用构造函数
	printf("%f\n", human->score(human));  //基类指针调用派生类中的函数。
	return 0;
}